Grating-machine



J. N. COLBY. GRATING MACHINE;

(No Model.)

No. 439,930. Patented Nov. 4, 1890.

n1: moms wnzna cm, mam-u-mm, wAsm UNITED STATES PATENT OFFICE.

JOHN N. COLBY, OF BOSTON, MASSACHUSETTS, ASSIGNOR OF TWO-THIRDS TO LOUIS ENGLEHARDT, OF SAME PLACE, AND ARTHUR LAIVRENCE, OF

WINTHROP, MASSACHUSETTS.

GRATlNG-MAQHINE.

SPECIFICATION forming part of Letters Patent No. 439,930, dated November 4, 1890.

Application filed April 8, 1890. Serial lib-347,030. (No model.) I

T at whom it may concern.-

Be it known that I, JOHN N. COLBY, or Boston, in the county of Suffolk, State of Massachusetts, have invented certain new and useful Improvements in Grating-Machines, of

which the following is a description sufficiently full, clear, and exact to enable any person skilled in the art or science to which said invention appertains to make and use the same, reference being had to the accompanyingdrawings, forming part of this specification, in which Figure 1 is a side elevation of my improved grater. Fig. 2 is an end elevation of the same,

looking from the left in Fig. 1; and Fig. 3, sectional views illustrating certain details of construction.

Like letters of reference indicate corresponding parts in the different figures of the drawings.

My invention relates especially to a device for grating lemons, fruits, vegetables, &c., for cooking purposes; and it consists in certain novel features hereinafter fully set forth and claimed, the object being to produce a simpler, cheaper, and more effective device of this character than is now in ordinary use.

The nature and operation of the improvement will be readily understood by all con- 0 versant with such matters from the following explanation.

In the drawings, A represents the clamp and B the grinding-disk. The clamp is U-shaped to adapt it to fit over the edge of a table or 3 5 stand 0, and is provided with a set-screw b for holding it in position thereon. The upper end of the clamp is forked, forming two arms d, in which is j ournaled a horizontally-arranged worm f. The grinding-disk B is secured to one end of said worm and is provided with a handle g for rotating it. The inner face of the disk is pricked up, or provided with sharp projections or teeth h, as shown in Fig. 2, for tearing away the body of the lemon, said teeth being formed on a plate 2', secured to said disk, as shown in Fig. 1. A horizontally arranged cylinder D, open at both ends, is secured to an arm d by means as best shown in Fig. 1.

of a screw j, one end thereof being in close proximity to the roughened face of the disk B,

A screw j passes through a slot is in the arm (Z, whereby the position of said cylinder in relation to the face of the disk B may be detached.

The cylinder D is provided with a longitudinal slot m. A nut 19 is fitted to slide loosely on the worm f. Pawls q are pivoted at t in the nut p, at opposite sides of the worm f, said pawls having a threaded head '0, (see Fig. 3,) adapted to mesh with the threads of said screw. Flat springs 20, secured to the nut with their free end in engagement with the long arms of said pawls tend, to hold said threaded heads in engagement with said worm. An arm :1: is secured to the nut pand projects 6 3 through the slot 01?. into the cylinder D. Flanges 1 are formed on said arm and engage the walls of the cylinder, said flanges serving as guides to prevent the arm from binding in said slot. A vertically-arranged disks, fitted to slide easily in the cylinder, is secured to the inner end of the armm bybrazing or other suitable means, said arm and disk forminga plunger for forcing the fruit through said cylinder against the grating-disk.

In the use of myimprovement, the long arms of the pawls q being depressed, the nut 1) may readily be moved from right to left on the worm f, withdrawing thereby the disk ,2 from the cylinder D. A lemon or other article to be grated is inserted in said cylinder and the plunger brought forward into contact therewith. The pawlsbeing released, their threaded heads '0 are meshed with the worm f. By rotating the disk B said worm is set in motion and the nut 19 caused to travel thereon from left to right, the disk 2 attached thereto forcing the lemon in the cylinder against the face i on the disk B. The teeth or projections h on said disk attacking the lemon grinds or 0 pulverizes it evenly, the product thus formed falling through the space between the disk and the adjacent end of the cylinderD into a receptacle on the table 0. It will be seen that as the disk B is rotated, driving the worm f, the nut 17 is conjointly driven thereby on said worm and the lemon or other substance in the cylinder continuously forced against the grinding-disk until itisthoroughlypulverized.-

When constructed as described, the operation of the device is exceedingly rapid and the parts so formed that they may be very readily separated or detached for cleaning. The device is equally well adapted forgrind- 1ng chocolate, nutmegs, and articles of similar nature.

Having thus explained my invention, what I claim is 1. The combination of a worm journaled in a standard, a grinding-disk thereon, a cylinder secured to said standard, and a nut fitted to travel on said worm, said nut carrying a plunger sliding in said cylinder,substantially as described.

2. In a grater, the combination of a clamp, a horizontal worm journaled thereon and bearing a grater-disk, a nut fitted to slide on said worm and provided with athreaded lever for causing it to work thereon, a horizontal cylinder on the clamp, and a plunger secured to the nut, substantially as described.

3. In a grating-machine, the clamp A and worm f, journaled therein, in combination with the grating-disk B, cylinder D, having a worm, a rotarydisk thereon,'a cylinder opening against said disk, and a nut traveling on the worm and bearing a plunger Working in the cylinder, substantially as described.

5. In a grater, the combination of a Worm bearing a rotary grating-disk, with a slotted cylinder on the worm-support and aunt bearing a plunger working in said cylinder, said nut being fitted to slide freely on the worm and provided with spring-cushioned toothed pawls meshing therewith.

6. In a grater, the worm f, journaled in the clamp A and bearing the disk B, in combi nation with the slotted cylinder D, the nut p, havingtoothed pawls q, and the plungerzon said nut, substantially as described.

7. In a grater, a forked clamp, a Worm journaled in the arms thereof, a grating-disk on said worm, a slotted cylinder secured to the clamp and opening against said disk, a nut fitted to slide on said Worm and bearing a plunger-disk working in said cylinder, and spring-pawls pivoted in said nut, said pawls having toothed heads meshing with the worm, whereby the nut may be caused to travel thereon, substantially as described.

JOHN N. COLBY.

. Witnesses:

O. M. SHAW, K. DURFEE. 

